Wow
Wow! A wealth of information here. Thank you so much Mike, Jake, Joshua.
On 12/16/11, jwfinn_at_lycos.com <jwfinn_at_lycos.com> wrote:
> Mike, I form mine on a 4-5" cylinder using p/d 1.8-2.0. They seem to work
> best in that range. Lower and you risk blade tuck with a flaring prop,
> higher and you run into pitch reversal with flaring blades. All of the blade
> area is kept forward of the spar to maximize flare, and I use carbon spars
> to maintain impact resistance while still having it floppy enough to flare
> under the torque of a thick motor. Make sure your wing spars and motorstick
> are good and strong though, as those take a lot of punishment and need to be
> rigid so the model won't twist up and dive when it hits something.
>
> Flying F1D in low ceilings requires either heavy flaring, a good VP, or VD.
> I've never used a flaring prop on F1D and would think it to be pretty
> difficult, albeit easier to build. VD is pretty critical in construction,
> but has fewer itsy bitsy parts than VP, IMO.
>
> A good F1D can bounce off the ceiling, walls, etc just fine if you have
> strong wing spars and posts. One that won't survive hitting the ceiling also
> isn't likely to survive steering. Definitely build a quarter motor dummy,
> though, as you gain a lot of information from quarter motor testing and can
> make many test flights in a fairly short flying session. You also waste less
> rubber when the quarter motors break. Whatever you do, don't let them break
> on the plane. It always involves carnage.
>
> Good flying,
> Joshua
>
>
> --- In Indoor_Construction_at_yahoogroups.com, "mkirda@..." <mkirda@...> wrote:
>>
>> So I am starting with a Cesar Banks Novice Penny plane.
>>
>> I will initially be flying only in 20-40 feet range, so I am looking for
>> recommendations for prop pitches.
>>
>> If I use the Propeller forming block Excel workbook, I enter in 12 inch
>> diameter, 2" block thickness. Not sure what I should look at for desired
>> P/D ratio. Maybe 2.0 or 2.2?
>> Will be using some leftover pink foam, so I could do more than one rather
>> easily - Just not sure what I should try first.
>>
>> I should probably already ask about F1D for the same flying spaces too,
>> with simple non-VP props...
>>
>> Thanks in advance!
>>
>> Regards.
>> Mike Kirda
>>
>
>
>
--
*Long live Free Flight!*
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*Ding Zarate*
Received on Fri Dec 16 2011 - 08:43:47 CET